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How do I (or can I) SELECT DISTINCT on multiple columns?
... @famargar for the simple case, yet, but they have different meanings semantically, and they are different in terms of what you can do for the step when building a larger query. Plus, people on tech forums can often be extremely pedantic about things, I find it often useful to add weas...
How do I choose between Semaphore and SemaphoreSlim?
...lim does not permit named semaphores, which can be system-wide. This would mean that a SemaphoreSlim could not be used for cross-process synchronization.
The MSDN documentation also indicates that SemSlim should be used when "wait times are expected to be very short". That would usually dovetail ni...
How to obtain the number of CPUs/cores in Linux from the command line?
...th the /proc/cpuinfo-based answers is that they parse information that was meant for human consumption and thus lacks a stable format designed for machine parsing: the output format can differ across platforms and runtime conditions; using lscpu -p on Linux (and sysctl on macOS) bypasses that proble...
Using an if statement to check if a div is empty
...
if( $('#leftmenu:empty').length ) {
// ...
Keep in mind that empty means no white space either. If there's a chance that there will be white space, then you can use $.trim() and check for the length of the content.
if( !$.trim( $('#leftmenu').html() ).length ) {
// ...
...
Where can I find documentation on formatting a date in JavaScript?
...
MM mean 01-12, not 1-12: 2013-04-17 => OK 2013-4-17 => BAD
– Adrian Maire
Apr 17 '13 at 9:10
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Java JUnit: The method X is ambiguous for type Y
...ssertEquals(Object, Object) is ambiguous for the type ...
What this error means is that you're passing a double and and Double into a method that has two different signatures: assertEquals(Object, Object) and assertEquals(double, double) both of which could be called, thanks to autoboxing.
To avoi...
What exactly is Python's file.flush() doing?
...ted by the runtime/library/language that you're programming against and is meant to speed things up by avoiding system calls for every write. Instead, when you write to a file object, you write into its buffer, and whenever the buffer fills up, the data is written to the actual file using system cal...
On showing dialog i get “Can not perform this action after onSaveInstanceState”
...o ignore the error? What happens when you do? After all, when clicking, it means that the activity is live and well... Anyway, I've reported about this here because I consider this a bug: code.google.com/p/android/issues/detail?id=207269
– android developer
Apr...
How can I mask a UIImageView?
...n the mask.contents, should CGImage. Not [CGImage]. If use bracket [ ], it means Array.
– strawnut
Oct 25 '19 at 2:44
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What is the different between 'Auto' and '*' when setting width/height for a grid column?
...r will talk about columns, but the same applies to rows.
In brief:
- Auto means size to column content and
- * means size proportional to grid
Auto means that a column is given as much width as the elements within it require.
The width of * sized columns is calculated by allocating space for the...